Phase only B1 shimming is a cost-effective and simple approach to improving RF field homogeneity for high field MRI. Without a multiple channel transmitter, this is implemented by switching transmission lines or possibly lumped element phase shift networks. This abstract investigates the minimum phase shift required in a potential multi-bit electronic phase shifter. For practical shimming solutions, those not requiring significant increases in power to achieve a 90 degree tip angle as compared to ‘birdcage’ or conjugate phase currents, it is concluded that 45 degrees may be a sufficient resolution for such a phase shifter.
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